<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script type="text/javascript">
			var a=123
			console.log(typeof a)
			a="123"
			console.log(typeof a)
			
			b=456
			console.log(b)
		</script>
	</body>
</html>
